package content

import (
	"fmt"
	"strings"

	"github.com/yaoapp/gou/connector/openai"
	agentContext "github.com/yaoapp/yao/agent/context"
)

// PDFHandler handles PDF documents
type PDFHandler struct{}

// CanHandle checks if this handler can handle the content type
func (h *PDFHandler) CanHandle(contentType string, fileType FileType) bool {
	return fileType == FileTypePDF ||
		contentType == "application/pdf" ||
		strings.Contains(contentType, "pdf")
}

// Handle processes PDF content
// Logic:
// 1. Check if uses.Vision is specified and supports PDF
// 2. If yes, use vision tool to handle PDF (images + text)
// 3. If no, extract text directly from PDF
func (h *PDFHandler) Handle(ctx *agentContext.Context, info *Info, capabilities *openai.Capabilities, uses *agentContext.Uses, forceUses bool) (*Result, error) {
	// TODO: Implement PDF handling
	// 1. Check if vision tool supports PDF
	// 2. If yes:
	//    - Call vision tool to handle PDF (handles both text and images)
	// 3. If no:
	//    - Extract text from PDF using default library
	// 4. Return Result with extracted text
	return nil, fmt.Errorf("not implemented")
}

// extractPDFText extracts text content from PDF
func extractPDFText(data []byte) (string, error) {
	// TODO: Implement PDF text extraction
	// Use a PDF library to extract text
	// Consider preserving layout/structure
	return "", fmt.Errorf("not implemented")
}

// handleWithVisionTool processes PDF using vision tool (for PDFs with images)
func handleWithVisionTool(ctx *agentContext.Context, data []byte, visionTool string) (string, error) {
	// TODO: Implement vision tool PDF processing
	// Some vision tools can handle PDF directly and extract both text and images
	return "", fmt.Errorf("not implemented")
}
